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x+4(x-7)=12+8x-4
We move all terms to the left:
x+4(x-7)-(12+8x-4)=0
We add all the numbers together, and all the variables
x+4(x-7)-(8x+8)=0
We multiply parentheses
x+4x-(8x+8)-28=0
We get rid of parentheses
x+4x-8x-8-28=0
We add all the numbers together, and all the variables
-3x-36=0
We move all terms containing x to the left, all other terms to the right
-3x=36
x=36/-3
x=-12
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